#content {
  width: 500px;
  height: 500px;
  background-color: #ccc;
  position: relative;

  .box {
    width: 10px;
    height: 10px;
    background-color: red;
    position: absolute;
  }
  .head {
    background-color: yellow;
  }
  #food {
    width: 10px;
    height: 10px;
    background-color: green;

    position: absolute;
  }
}
